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Specification: Measuring Range :0-100‰ Salinity Salt water specific gravity range: 1.000-1.070 SG ATC compensation Range: 10°C~30°C (50°F~86°F) Reference Temperature: 20°C Operation: 1: Place a few drops of the liquid on the main prism. 2: Cover the prism,look through the eyepiece against the light. 3: Adjust the eyepiece to the clear state. 4: You can read the result value on the scale. Package list: 1 x Refractometer 1 x Plastic box 1 x Pipette 1 x Screw driver 1 x Cleaning cloth 1 x Instruction manual in English